Crank or crank-shaft of internal-combustion engines



A. W. WALL.

CRANK 0R CRANK SHAFT 0F lNTERNAL COMBUSTION ENGINES. APPLICATION EILED 05c. 2?. 191a.

6,5 v A v Patented Apr. 13,1920:

MM M W W UNITED STATES PATENT OFFICE.

ARTHUR WILLIAM WALL, 0F SHELDON, NEAR BIRMINGHAM, ENGLAND.

CRANK OR CRANK-SHAFT OF INTERNAL-COMBUSTION ENGINES.

Application filed December 27, 1918.

To all whom it may; concern:

Be it known that I, ARTHUR l/VILLIAM HALL, a subject of the Kin dom of Great Britain. residing at The Jaurels, Lyndon End, Sheldon, near Birmingham, in the county of lVarwick, England, have invented certain new and useful Improvements in or Relating to the Cranks or Crank-Shafts of Internal- Combustion Engines and to the Manufacture of the Same, of which the following is a. specification.

The present invention comprehends certain improvements in or relating to the cranks or crank-shafts of internal-coinbustion engines and to the manufacture of the same, and comprises a composite crankshaft built up from stampings, pressings, or the like in which hollow crank pin and crankshaft portions have been produced by displacing the metal in a direction axially of said crank-pin and crankshaft. The crankshaft according to the present invention is advantageously manufactured from sheet metal blanks by pressing or stamping tubular crank-pin and crankshaft portions, the junctures between which occur at three positions. viz: those of the crank-pin, the crankshaft and the crankarm.

In order that this invention be clearly understood and readily carried into practice. reference may be had to the appended explanatory drawing, which illustrates in sectional elevation an embodiment of the present invention.

In a convenient embodiment of the present invention. each crank consists of two circular stampings, each involving a disklike part a. In each stamping a aneccentrically located projecting hollow boss I) is stamped. These projecting bosses are adapted to adjoin each other and constitute the crank-pin. The edges of the bosses may be serrated or formed with dogs 0 or the like,

Specification of Letters Patent.

Patented Apr. 13, 1920.

Serial No. 268,546.

by welding, riveting, or the like, and the sleeve f may pass also through the disks a and be swaged over the latter, to thereby brace two of the disks a and the intermediate two disks 03 together.

A screw or bolt may pass through the interior of the composite crankpin; this screw or bolt 9 may have a countersunk head adapted to engage with one of the disks d, and the said screw or bolt may be screwed internally into the interior of the boss I) appertaining to the other disk a, and also if desired into the remote disk d. The disks and bosses are thereby effectively connected together, at the axes of the crank pins,while by removing the screw g the crankshaft may be divided into parts at the crank pin. A screw such as g may be utilized to connect together the disks a, d, but a sleeve 7' is preferably used in a case in which, as shown, it is desired that the crankshaft should be hollow. In the wall of this hollow part of the crankshaft, perforations h are provided adapted to admit explosive mixture from a port in the stationary bear ing of the crankshaft. This explosive mixjture is thereby admitted to the crank chammm.

The bosses 7) or 6, instead of being connected as above described may be in sleeve connection, one being adapted to project into the other. The disks a, 03 instead of being connected in the manner described, may be formed with flanges, one of which fits within the other to convert each member a, (Z into a drumdike member.

In each or certain of the disk-like crankarms a, d, an elongated, segmental, or arcshaped opening (not shown) may be provided. This opening may be adapted to uncover an alternative arrangement of gaseous inlets provided in the crank-chamber to admit mixture or mixture and air thereto. In this embodiment the crank-arms may have a running compression-tight fit with the crank-chamber so that the gaseous ingress provision is intermittently closed and opened, the crank-arm being thus adapted to function as a rotary valve.

What I claim as my invention and desire to secure by Letters Patent is 1. A composite crank shaft comprising a series of disks having inte al hollow bosses constituting crank pin an crank shaft portions, said bosses being formed with interbeing toothed at their ends to provide'a sim- 10 engaging dogs. 4 pie connection. I v

2. A composite crank shaft comprising a 1 In witness whereof I have hereunto set plurality of clircularldisls provided with my hand.

' ,5 osses stampec out tlere rom at eccentric r and concentric positions, the bosses at the ARLHUR WILLIAM WALL concentric positions constituting the crank In the presence of shaft and'the bosses at the eccentric posi- ARTHUR H. BROWN,

tions constituting the crank pins, the bosses Y EDGAR N. VVHEELER. 

